Pipe-die



(No Model.)

J. KREGER.

PIPE DIE.

No. 419,458. Patented Jan. 14,1890.

flttorneys UNITED STATES PATENT OFFICE;

JOHN KREG'ER, OF BUFFALO, NE\V YORK.

PIPE-DIE.

SPECIFICATION forming part of Letters Patent No. 419,458, dated January 14, 1890.

Application filed October 9,- 1889.

declare that the following description of my said invention, taken in connection with the accompanying sheet of drawings, forms a full, clear, and exact specification, which will enable others skilled in the art to which it appertains to make and use the same.

This invention has general reference to improvements in pipe-threading die-stocks; and it consists, essentially, in the novel and peculiar combination of part-s and details of construction, as hereinafter first fully set forth and described, and then pointed out in the claims.

In the drawings already mentioned, which serve to illustrate my said invention more fully, Figure 1 is a side elevation of my improved device for threading pipes, bolts, and similar objects. Fig. 2 'is a plan of the same. Fig. 3 is a similar view with the die-holder removed, Fig. 4 is a transverse sectional view of the die-holder detached. Fig. 5 is a plan of the device for centering the pipe within the die-stock and for guiding it to the pipe-threading die. Fig. 6 is a plan of the fixed disk of said guiding device, and Fig. 7 a plan of one of the radial bars used in connection with said disk.

Like parts are designated by corresponding letters and figures of reference in all the figures.

The object of this invention is the production of an efficient device for screw-threading pipes, rods, and similar articles, and especially one which may be used in confined positions,where the ordinary pipe-threading devices are inoperative on account of lack of space to revolve the pipe-stock carrying the pipe-threading die.

To attain these results, I construct my device substantially of a stock A, having centrally an annular body A and terminating in a socket S, into which is removably placed the end of a handle A, said stock A being provided with a further handle A to manipulate the device in a proper manner.

Upon the stock A islocated an upwardlyprojecting lug d, having near its end a trans- 1 Serial No. 326,412. (No model.)

versely-arranged screw-threaded aperture to receive a correspondingly-threaded spindle 6, having on one end a buttonfand on the opposite end a further button 9, as clearly shown in the drawings. Upon this stock A and von both sides of the lug (Z are pivoted pawls E E by means of bolts h h, the shanks 1 and 20f which are properly perforated to receive the screw-spindle e, heretofore mentioned, springs g g being interposed between said pawls and the lug d to push the shanks of said pawls away from said projecting lug, as will hereinafter more fully appear.

In the annular portion A of the stock A there is centrally an aperture a for the reception of the shank B' of the die-holder B,

while the said stock A, as well as the socket- S, is undercut at a a for the reception of the taper portion B" of said die-holder, though, if so desired, these portions may be 1 left straight Without interfering with the proper operation of the device.

The die-holder B has an angular recess b" to receive a pipe-threading die 3, and centrally a passage 1) for the pipe to be threaded,

, its recess 1)" by a pivoted cover I), secured to the head of the die-holder by a screw m and a thumb-screw n, in the usual and well-known manner.

Below the head of the die-holder are formed stock A and upon the said shank B is 10- cated an annular disk 0, (shown in detail in Fig. 5,) having cam-shaped recesses c, the edges of which are depressed at c and grooved at c to receive the toes m of sliding bars M, which bars move in properly-arranged grooves 0, Fig. 6, located in an annular boss or projection O on a disk 0, which said disk is suitably fastened to the shank B of the dieholder, and has laterally projecting a dial properly graduated at 0 to indicate, in conjunction with a pointer 0" on the edge of the disk 0, the position of the bars M, which, as

well as the disk 0, are held in position by a said pipe-threading die 3 being held within a series of ratchet-teeth or serrations B, with plate T, Fig. 1, and screws (not shown) enterin g threaded apertures 03 w in the annular projection O, as clearly illustrated in Figs. 6 and 7. The graduations 0' on the dial are so set that when the operator desires to screwthread a certain size of pipe he rotates the disk 0 until its pointer 0" indicates that particular size upon the dial, there being a stop .9 upon said dial to prevent the disk C from being revolved too far, which would cause the guide-bars M to run out of their grooves. Instead of this stop 3, I may, if desirable, plug the outer ends of the grooves c or the end of the cam-shaped recesses c to prevent the sliding bars from being displaced; but- I prefer the former construction on account of its simplicity.

In using this device the thumb-screw n on the die-holder is loosened and the cover swung open, whereupon a pipe-threading die of the size required is placed into the angular recess and the cover replaced and fastened. The disk C is now revolved, causing the bars M to mox e radially toward the center of the die-holder, on account of the can1-shaped recesses in said disk actingupon said bars, until the pointer thereof reaches the mark on the dial indicating the correct size. It the thread to be cut is a right-hand one, the screw-spindle e is revolved until the dog E engages the ratchet-teeth B, while the dog E is set free;

but if a left-hand thread is to be cut the screw-spindle is moved in an opposite direction. so that the dog E engages the ratchetteeth and the dog E is set free. By now moving the handle A" or both handles A and A back and forth the pawl that en gages the ratchet-wheel will cause the die-holder to revolve, and thereby to thread the pipe. Engaging both dogs with said ratchet-wheel will lock the die-holder, so that to thread the pipe the entire pipe-stock must be revolved.

It will now be seen that in confined places, where the entire pipe-stock cannot be revolved, the pipe may be readily threaded by actuating the handle A and engaging the die-holder by the proper pawl, as heretofore described, removing the handle A from its socket S, if necessary, to reach into corners and other places not otherwise accessible.

Having thus fully described my invention, I claim as new and desire to secure to me by Letters Patent of the United States 1. In a pipe-threading tool, the combination, with the stock having an annular central portion and a removable handle, of a die-holder having ratchet-serrations and pawls pivoted upon said stock and engaging said serrations, said pawls being actuated by a screw-spindle in conjunction with springs, as and for the purpose set forth:

2. In devices of the kind described, the combination, with the stock having the upwardlyprojecting lug provided with a screw-threaded aperture, of two pawls pivoted upon said stock, and a screw-spindle having buttons, as described, acting upon the shanks of said pawls, as and for the object stated.

3. In apipe-threading tool, the combination, with the stock having the central body A of a centering device and die-holdercombined, consisting of a recessed head having a serrated portion 13' and shank B, the disk 0, having cam-shaped recesses, the disk 0, provided with the grooved annular rise, the radius-bars actuated by said cam-shaped recesses, and the plate to retain said radius-bars in position, as and for the object set forth.

L. In devices of the kind described, an adjustable guide and centering device consist-- ing of a disk 0, having cam-shaped recesses c, grooved along their edges, and a pointer 0", of a further disk 0, having annular projection 0, provided with radial grooves 0 and an index-dial o, and the radius-bars M, having toes m, engaging the grooved cam-shaped recesses, as and for the object stated.

I11 testimony that I claim the foregoing as my invention I have hereto set my hand in the presence of two subscribing witnesses.

JOHN KREGER.

Attest:

WM. 0. STARK, EMMA A. S. DOPP. 

